I doubt that LISTSERV itself is doing this. The closest I can come to this (with Eudora) is: Subject: [TEST] IMPRESOS PROYECTOS I+D DE INVESTIGACI=D3N B=C1SICA NO ORIENTADA DEL PLAN NACIONAL IDT 2000-2003 DISPONIBLES EN INTERNET , and if I have IETFHDR set instead of SUBJECTHDR (no attempt made by LISTSERV to prettyprint the headers) I get Subject: IMPRESOS PROYECTOS I+D DE INVESTIGACI=D3N B=C1SICA NO ORIENTADA DEL PLAN NACIONAL IDT 2000-2003 DISPONIBLES EN INTERNET , I suspect that the problem is in either or both the receiving or sending mail client(s). I will make the point that this subject line is extremely long and some attempt should probably be made to shorten it anyway. Nathan